[rules-users] Re-sending : Unexpected MVEL plus operator behavior (string-to-double), in consequence block

[Kinshuk Adhikary]

Using
drools 5.1
mvel 2-2.0.14

In consequence (then) block : (dialect strict or not does not make a difference)

Trying to sum up some numbers after a multiplication operation. For example :

t.out = t.in2*t.in3 + t.in3*t.in4 + t.in2*t.in4;

(the object t has all its attributes of the type String), all the t.in parameters are actually numbers-as-strings.

So the multiplication is going on fine, as expected, but the addition (+) sign, is concatenating instead of adding.

So the for inputs "1", "2" and "3", the result looks something like : 2.06.03.0  (i.e concetenated) instead of the expected 11.0.

What is going worng  How does the + operator decide to do concat instead of doing addition.

Any documentation on this + operator logic ?

Note : The above works fine when I use MVEL without Drools.

Thanks 



      
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